Lens Vision Type
Single vision lenses are prescribed for one field of vision. Single vision lenses have the same prescription strength throughout the whole lens and can either be used for correcting distance or near vision.
A bifocal lens is used for distance and near vision. The upper portion of the lens will convey the distance prescription, while a lower window conveys the reading portion.
Trifocal is used for distance and near vision, but it also has an intermediate portion, used for computer work, or anything else done at an arm’s length.
Progressive lenses are the most functional of the lenses. Progressive lenses convey continuous vision without the use of traditional windows. This lens offers a smooth transition from distance, to intermediate, to near, without any visual jumps or tell-tale lines.